Common E-bike Battery Problems and How to Fix Them. 52 volt ebike battery

Common E-bike Battery Problems and How to Fix Them

There’s nothing worse than having to spend hundreds or thousands on an eBike only to have problems with its battery. Don’t get me wrong; e-bike batteries are built to last. but they’re still prone to failure if they aren’t adequately taken care of during their lifetime.

What happens if your battery fails?

Well, in this article, I’ve covered some most common eBike battery problems and how to fix them. So, if you’d like to know more. keep scrolling!

Ebike Battery Problems

When it comes to eBike troubleshooting, there are a couple of things that might be causing your battery problems, including:

  • eBike battery pack swelling
  • eBike battery not charging
  • eBike battery not running for very long
  • eBike battery pack not holding a charge
  • eBike not turning on
  • eBike not speeding up

Don’t worry, though. I’ll walk you through each one here!

eBike Battery Pack Swelling

If your eBike battery pack is swelling up, well, you likely have a pretty serious problem with one. or more. of the lithium-ion cells.

Some electric bike models use flat pack cells. and these are known to swell if they suffer some damage. On the other hand, the 18650 lithium-ion cells are far more resistant to swelling and, in turn, more reliable.

If you notice that your eBike’s battery pack has a bulge in it, be sure you turn off the power and carefully remove the battery from your eBike. It’s a good idea to recycle the battery; most cities have a place where you can do this.

Now, some eBike battery packs are positioned inside the bike’s frame. That makes it somewhat harder to notice if you have a swollen battery pack.

The only way to check if the battery is swollen is to drop the lower plate and take out the battery pack. Note that you’ll have to disconnect some cables before you do this.

eBike Battery Not Charging

If your battery isn’t charging, start by checking the following:

  • Is the power turned on at the outlet?
  • Is the charger working and outputting over 36 Volts?
  • Is the battery hot?
  • Is the battery charger port full of dirt?
  • Has the battery been left discharged for several months?
  • Has the fuse blown in either the eBike battery pack or the charger?

eBike Battery Not Running For Very Long

Lithium-ion batteries generally have a life of 700 charge cycles. They usually tend to lose full charge capacity over this mark.

That is entirely normal. and will, unfortunately, only get worse as time goes on.

Still, if you’re charging your bike every few days, you should be able to get many years out of your electric bike before you begin to notice the capacity of your battery is starting to degrade.

If you notice your eBike battery isn’t running as long as it used to, check the following:

  • Is the battery pack being charged to 100%?
  • Do you have a dragging of a disc brake?
  • Is the terrain uphill?
  • Are you assisting your battery by peddling?
  • Are your eBike’s wheel bearings freely spinning?
  • Do you have a short circuit in the battery, wiring, or motor?

Any of the scenarios mentioned above could lead to your battery discharging rather quickly.

eBike Battery Pack Not Holding A Charge

Lithium-ion batteries are good at holding a charge. However, like any other type of battery, they will slowly discharge over time.

If your eBike hasn’t been charged for a more extended period, it would be a good idea to give it a top-up. and see how it goes.

If you notice that you’re charging your battery, but it still discharges quickly without being used, you might have a short circuit somewhere or a faulty battery at your hands.

Here’s a quick test that can detect the problem:

Remove the battery pack from your eBike and charge it up on a bench. Once it’s fully charged, test the battery by leaving it off the bike.

If it holds a charge, the issue will be your electric bike. most likely a short circuit in the bike’s wiring or the motor. However, if it doesn’t hold the charge, your lithium-ion cell is faulty.

How Do I Know If My Bike’s Battery Is Charged?

Your battery charger will probably feature a LED light indicator that changes states depending on the bike’s battery level. It’ll go from red to green when the battery is fully charged in most cases.

However, in some chargers, the LED light will turn off completely when the battery is charged.

Either way, the point remains the same. you’ll have a way to track the progress while charging the battery.

Remember not to leave the battery pack on the charger longer than 24 hours, though.

Lithium-ion batteries don’t prefer being left on the charger. In the short term, this won’t hurt. but after a while, the battery’s capacity will go down.

You’ll also have an indicator of the battery’s current level on the battery pack itself or the speed controller. Some will use a 0-100% range, while others have a series of LED lights, depending on the model.

eBike Not Turning On

Let’s start with the obvious solution:

If your e-bike isn’t turning on, be sure to check if the main switch is in the “On” position.

Next, check the fuse for the battery pack. This fuse is usually located on the side and could blow up because of short circuits, vibrations, over-current, or old age.

If the fuse is in good condition and the battery pack is fully charged, check if the speed controller is in good condition, as well. The speed controller is the component that sends signals to turn on the battery pack.

These speed controllers could malfunction if damaged. either by dropping your bike or allowing water to get into them.

Hold the bike’s “On” button for about 10 seconds to force the speed controller to turn on. Some speed controllers are turned on by pressing the “M” button. Again, it depends on the e-bike model you have.

Be sure to check that your battery pack has at least two bars of power. An extremely low battery power level can lead to your electric bike not turning on, by the way.

Another thing to check here is that the electrical cables are correctly connected. Sometimes, the dirt roads can dislodge the cable connections; this is often the case with mountain electric bikes.

Water can find its way into these connections, too. Pull them apart and ensure the connection is tight.

eBike Not Speeding Up

There are numerous reasons why your electric bike isn’t speeding up.

often than not, the feedback magnets. positioned on the pedal crank or the rear wheel hub. for the proximity switch get dirty. Clean them with a rag, and you should be good to go.

This common eBike battery issue is often wrongly diagnosed.

Most quality electric bikes feature a switch on the back and front brakes to stop the drive motor. In some cases, these switches can get stuck. leading to their failure. Activate both brake levers a couple of times to try and free up the switch.

To check the limit switch, though, you might have to remove the whole rear or front brake lever. That’s another reason why you should avoid leaving your eBike out in the rain.

Also, while it might sound obvious, be sure to check if you’re in the proper mode. for example, pedal-assist, throttle-only, or pedal-only. I’ve sometimes found myself in the wrong mode, and I couldn’t figure out why my eBike isn’t speeding up.

There is typically a minimum speed that will activate the drive motor. That is just a safety feature. and it’s usually around 1.8 mph.

What Speed Are eBikes Limited To?

eBikes are limited to 25 km/h. or 15.5 mph. to conform to the majority of road rules around the globe. Once the motor reaches this speed limit, it will stop providing power further.

Of course, you can still pedal faster than 25 km/h, but you won’t get any assistance from the main motor.

Once the speed controller recognizes that you’re under 25 km/h, the battery management system will again supply power to the main motor. That is a standard component on most electric bikes. and, again, its role is to ensure that you conform to road rules.

Is 250Watts Enough For An eBike?

In most standard cases of use, 250W is more than enough power for you to ride your eBike on asphalt or dirt roads casually. A 250W drive motor is usually limited to 15 mph and can handle up to 240 pounds in rider weight.

If that doesn’t sound impressive, remember that you can always assist the main drive motor by pedaling.

You can always upgrade your bike with a Bafang conversion kit, though!


We can agree that e-bikes have come a long way since their first appearance. Granted, battery problems can occasionally happen, but most can be solved easily and quickly.

Hopefully, the tips I’ve outlined above will help you keep your eBike running fast. and for a long time. And remember:

The most significant danger to batteries of eBikes is excessive heat and low voltage. Make sure you keep your eBike battery topped up. and it will last for a very long time.

About the author

Emma was born and raised in the UK, studied in Amsterdam (where she discovered her passion for biking), and is currently living in Ohio. Her main passion is cycling, that’s why she is always looking for an amazing new e-bike to make her journey even more unforgettable!

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Hi I just bought a new e bike First time i have used it all was fine When i wanna charge it for 1st time there has been no charge sept by the battery. The charger la good but the battery don t keep charge The fuses(2) are good and electricity crosses the battery but don t keep charge. The company replaced the battery without see it but i liked To know if it s something To do with that problem Best regards

My ebike will cut out. I then have to remove the battery and then put it back in. The bike will run ok for a minute or two but cuts out again. I remove the battery and put it back in. It cuts out again after a minute or so. The battery still shows 2-3 bars full. Is my 4 year old battery bad, or is it some other component?

This just happened to mine. Did you resolve your issue? any suggestions? It had 2 to 3 bars when it cut out. Took battery off and back on and it powered up but quickly cut out and never powered on again. My battery seems to charge. Gonna try again, but worried it will give out again.

I have a new bolt pro ebike. At times it’s fine oother times it’ll just die on me. Today I charged it. I rode it it was fine then it would stop. The green lights wouldn’t come on. I go home put charger unn port for battery they say it’s fine. I’m getting angry maybe I should get a new battery but it’s pretty new. I come home charger is red for 30 minutes I leave it’s fine then it dies. What is rhis should I get a new charger,?

I have a rear motor hub kit 1000W 52volt and I’ve had it for about 2 years no issues untill few months ago I got a 03 error code on my ktlcd3 screen which after reading in the manual pointed to hall sensor issue, so because the sensors were only about a dollar each I just changed all three rather than testing anything and I was back on the road 100%. No just a few days ago I got the same error code so I changed the sensors again only this time I’m still getting the code 03 error. I checked out every wire took everything apart made sure everything was good nothing was touching anything it shouldn’t be I changed the sensor in the throttle. Now when I plug everything back in I’m not getting the 03 error anymore but I’m also not getting any power from the throttle and on the screen is not recognizing any battery power even though I have two battery packs both 52 volt fully charged. What could I have done I never had an issue with the battery before showing on the screen as always been accurate. I’m going to keep checking everything again I just needed to take a break before I go crazy luckily for me I’m in Ontario and it’s freezing cold outside so it’s not that big of a deal but I was wondering if you had any ideas something I could check or do to get this thing going again. Thank you for your time have a nice day

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Battery Model 52V20
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Cell Combination 14S4P
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Discharge Cutoff Voltage 41.6V
Charge Cutoff Voltage 58.6V
Rated Discharge Current 40A
Instantaneous Maximum Discharge Current 50A
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How Long Does It Take to Charge 52V E-Bike Battery? Quick and Effective Charging Guide

No doubt e-bikes have brought in new dynamics for all casual commuters, working professionals, adventurers, cycling enthusiasts, etc. That’s why the demand for ebike is increasing excessively.

However, their batteries and it’s charging have become the most concerning query of all. One of the most frequently asked questions is how long to charge a 52V ebike battery in order to maintain its health and increase its lifespan.

But, Why 52v ebike battery only? Because it’s mostly used in high-powered e-bikes such as 750w and above. Hence, knowing the working of a battery like its charging time, what are the expenses, maintenance, and similar questions are very important.

If you have a 48v ebike battery, I have already covered how long to charge a 48-volt electric bike battery with various AHs. Don’t miss to read. This article aims to FOCUS on the 52v ebike battery charging time and also cover all answers to the frequently asked questions by riders. Let’s begin.

Introduction to 52-Volt Ebike Battery

An e-bike battery, especially a 52V one has a higher level of power and capacity to provide as compared to a 36V or 48V battery. It can store more energy if you increase the AH, which means it can power an e-bike for a longer distance and provide more power to the motor, learn more.

over, the charging time for a 52V e-bike battery can vary depending on the battery’s capacity (AH) and charging rate. Where it can take several hours to charge the battery fully, but some fast chargers can reduce the charging time significantly.

How Long to Charge a 52V Ebike Battery | Factors Affecting 52V Ebike Battery Charging Time

As I have already mentioned that a 52v battery on ebikes is great and powerful and comes with different AHs starting from 15 Ah to 40 Ah. Battery with higher AH takes long hours to charge and vice-versa.

Apply this formula to calculate the charging time for a 52v ebike battery:

Charging time = Battery’s AH/Charger Amp

For instance, a 52v battery with a 20Ah capacity and a charger of 4 Amps. Let’s calculate how long will it take to charge using the above formula:

Charging time = 20 Ah / 4 Amp = 5 hours

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As you can see a 52-volt electric bike battery takes around 5 hours when charged with a 4 amp charger. If you increase the charger amps, the charging time will reduce and vice-versa.

Let’s see some important factors that affect 52V ebike battery charging time.

Charging Voltage

A 52V ebike battery requires a charger with a minimum output of a charging voltage of 58.8 volts. This is because the battery has a nominal voltage of 52V, but requires a slightly higher voltage for charging.

Because a fully charged 52v battery has a voltage of around 58 volts. So if you don’t charge the battery with a compatible charger, it will take long hours to charge it as well as it may damage the battery internally.

Charging Time

When it comes to the charging time for a 52V electric bike battery, it can vary depending on the battery’s capacity (Ah) and the charging rate of the charger. AH stands for Amp-hour of the battery which is considered as the fuel tank.

Charging time = Battery’s AH/Charger Amp

For eg: 20 Ah/4 Amp = 5 hours

52v battery with higher Ah will take long hours to charge and vice-versa. Therefore, a 52-volt battery can take anywhere between 4-8 hours to fully charge in order to last you for one long ride.

Charging Current

For a 52V e-bike battery it gets essential to use a charger that lies within the charging current range either by calculating the capacity or as specified by the manufacturer. Additionally, it should be noted that charging at a higher rate can hold your battery at damaging risk. So don’t do that!

Charge Indicator

In order to make your job easy and to ensure you charge your 52V e-bike battery at a correct and consistent rate we advise using a charge indicator that shows you the current level of the battery. Hence, allowing you to monitor the charging process.

Charging Cycles

A 52V lithium-ion battery has a limited number of charge cycles before it starts to degrade and lose capacity. It’s important to avoid overcharging or undercharging the battery, as this can reduce its lifespan and overall performance.

Charger Cost

This has to be one of the “often overlooked” factors. It is evident that a 52V e-bike charger is expensive. However, there are some cheap chargers available in the market as well but branded chargers have high quality and take standard time to charge the battery without affecting the battery.

Overall, a 52V e-bike battery can provide higher performance and a longer range compared to lower-voltage batteries, but it’s important to use a compatible charger and follow the manufacturer’s guidelines to ensure safe and optimal charging

Type of Ebike Battery Chargers Their Charging Speed

Depending on your convenience and your e-bike there are multiple chargers available in the market that you can resort to for charging your 52V battery.

Hence, let’s see what options you get and how long it takes to fully charge your 52V ebike battery.

Standard ChargerFast ChargerPortable ChargerUniversal Charger
The charging output offered is around 58.8 Volts. Even after having the same voltage of 58.8, fast chargers are designed to charge at a higher rate than a standard one. This is one of the smaller, lightweight options for charging your 52V e-bike battery with a voltage of 48V. If you have multiple batteries and e-vehicles then this is probably the best charger for you since it is designed for different-volt batteries.
In a standard charger, the current generated is around 2-5 amps. The charging current is 5 to 10 amps, which helps in the same efficient charging. Being a smaller charger the charging current range is comparatively lower, say 1 to 3 amps. It typically has a voltage of 50V and a current range of 5 to 8 amps.
The overall time taken by a standard charger to fully charge your 52v e bike battery is 4 to 8 hours. Having a higher current range helps bring down the charging time to 2 to 4 hours. The charging time, when you are using a portable charger, depends highly on the capacity of your battery. However, the charging duration for a 52V e-bike battery will take around 3 to 5 hours.

Additionally, what type of charger you should use for minimizing the time taken to charge fully also depends on the type of e-bike you are using like MTBs, hybrid e-bikes, and so on. Thus, we recommend consulting the manufacturer of not only the e-bike battery but also the e-bike.

Charging Tips for Ebike Battery to Maintain Prolonged Battery Life

The charging timeframe for a 52v ebike battery is highly influenced by your maintenance capabilities. This is essential for having a prolonged battery life, generating optimum performance, and ensuring a longer life.

Here are a few ways by which you can maintain a healthy battery as well as inclusive tips for charging your 52V e-bike battery faster.

Avoid overcharging

Overcharging your 52V e-bike battery can damage it and reduce its lifespan. To avoid this, unplug the charger as soon as the battery is fully charged. For such conditions, the charge indicator comes as a great rescue.

Avoid deep discharging

Deep discharging your 52V e-bike battery can also reduce its lifespan. To avoid this, try to recharge the battery before it’s completely drained. Apart from that avoid letting it sit for long periods of time without recharging.

Don’t charge at higher rates

To charge your 52V e-bike battery faster, use a charger with a higher charging current output. over, make sure that the charger is compatible with your battery, as charging at a higher current than recommended can damage the battery.

Avoid extreme temperatures

For maintaining a healthy battery avoid exposing your 52V e-bike battery to extreme temperatures, as this can damage it and reduce its lifespan. Try to store and charge the battery in temperatures between 10°C to 25°C (50°F to 77°F).

By following these tips, you can maintain and prolong the life of your 52V e-bike battery, and also charge it faster without causing any damage.

Common Charging Mistakes to Avoid While Charging Electric Bike Battery

Just following the maintenance tips is not enough, instead knowing what not to do as a precaution helps charge your 52-volt e-bike battery way faster than you would think.

Here are some rookie mistakes you can avoid while charging.

Charging immediately after the ride

The battery becomes hot during after the ride. Most of you plug it to charge just after the use which increases the temperature of the battery. So don’t do that. You must allow a battery to cool down for a minimum of 15 to 20 minutes in order to reduce the risk of damage from overheating.

Storing a fully charged battery

If you are storing your 52V e-bike battery for an extended period, store it at around 50% charge. Storing the battery fully charged can damage the battery cells and reduce the overall lifespan of the battery.

Storing a fully depleted battery

Battery degrades when not in use for a few months. Still, most people store their ebike battery at a low charging level, and therefore such batteries become dead. If you do so, will face challenges while charging a dead battery and the lifespan will reduce.

Charging too fast

While it is possible to charge your 52-volt e-bike battery quickly, it is important to avoid charging it too fast. Charging the battery too quickly can generate excess heat and cause damage to the battery cells.

Undercharging the battery

Allowing your battery to be discharged completely can also damage the battery cells and reduce the overall lifespan of the battery. Charge the battery as soon as it reaches the recommended discharge level.

Conclusion About How Long to Charge a 52V Ebike Battery

The charging time for a 52V ebike battery depends on several factors such as the battery capacity, the charger output, the charging method, and the level of depletion of the battery.

Generally, it can take between 4 to 8 hours to fully charge a 52V ebike battery using a standard charger, while a fast charger can reduce the charging time to around 2 to 4 hours.

However, it’s important to note that charging duration can vary based on the specific e-bike battery and charger used.

Hope we could help you with these queries and assist your riders!

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Frequently Asked Questions

Can I charge a 52V e-bike battery overnight?

It is generally not recommended to charge your 52V e-bike battery overnight, as overcharging can damage the battery and reduce its lifespan. It is best to unplug the charger as soon as the battery is fully charged.

How often should I charge my 52V e-bike battery?

It is best to charge your 52V e-bike battery after each use or when the battery level reaches around 20-30%. Avoid allowing the battery to fully discharge, as this can damage the battery and reduce its lifespan.

Can I use a faster charger to charge my 52V e-bike battery?

Using a faster charger may reduce the charging time for your 52V e-bike battery, but it is important to ensure that the charger is compatible with your battery and that it does not exceed the recommended charging current. Charging the battery too quickly can generate excess heat and cause damage to the battery cells.


Bittoo Gupta

I am the founder and editor of The Bike Fetcher, a passionate E-Biker. My passion for E-bikes led me to build this blog site where I share electric bike news updates, my e-biking experience, e-biking tips, e-bike battery tips and help people to get the best e-bike. Feel free to contact me on my social accounts or through the contact form.

Li-Ion Ebike Battery Charge Charts

Whats an 80% charge on a 48v battery? on a 36v? 52v? These charts give answers to questions like these on all common ebike battery voltages.

Remember, ALL numeric charts show ballpark values that may be numerically correct, but no generic chart can match your individual cell characteristics, your pack’s age or its chemistry. Bottom line: imperfect charts like this are still good baseline references. Use these and teach yourself how to read the voltage gauge on your display screen.

Quite some time ago, I produced a series of charge status charts for a variety of common lithium-ion battery voltages. They’ve become a fairly common link to help folks out on various groups who use these battery voltages in their ebikes.

I built them using Google Sheets, so they are not web pages, which I suppose has kept them from being widely linked in search engine results when people are looking at such things.

Here for the first time are direct links to the charts on a normal web page.

Volt (10S) Battery Charge Chart

The first link is to the lowest voltage: 36v. Generally this is the lowest voltage you will find on a modern, commercial ebike. Note that its called ’36 volt’ but really that is the ‘nominal’ value. A 36v battery is actually fully charged when it is at 42.0 volts.

Volt (13S) Battery Charge Chart

The next common size is 48v. These batteries are fully charged at 54.6 volts.

Volt (14S) Battery Charge Chart

The next battery voltage is 52v and very common. 52v batteries will work on systems designed for 48v, and why is easier to understand when you become aware that a ’48v’ battery really tops out at over 54 volts. A ’52v’ battery tops out at 58.8v, so it essentially lets you use a 48v system for a longer time at higher voltage levels that it is already designed to utilize.

Volt (16S) Battery Charge Chart

With a 100% charge voltage of 67.2 volts, when you have one of these you are getting into high voltage territory

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